A SENIOR referee officiating in a national football tournament will face the ACT Magistrates Court on Thursday after he allegedly indecently assaulted a 16-year-old referee, say police.

Police received reports on Tuesday of incidents that occurred during team-building activities conducted before the tournament.

Police will allege the incident occurred on Saturday afternoon with several people witnessing it.

The 66-year-old New Zealand resident was arrested on Wednesday night and charged with one count of indecency against a young person under special care.

Anyone who can assist police should call 1800 333000, or via the Crime Stoppers ACT website.